Thermofluid printing ink



Patented June 20, 1944 UNITED STATES PATENT OFFICE THERMOFLUID PRINTING INK Frank G. Breyer, Wilton, Conn, assignor to J. M.

Huber, Inc., New York,

New Jersey N. Y., a. corporation of No Drawing- Application July 11, 1940, Serial No. 344,847

4 Claims.

This invention relates to new and improved I.

thermo-fiuid printing inks for use with the Cold set printing process disclosed in a copending application of Walter Huber, filed August 3, 1939, now United States Patent No. 2,268,594.

The object of this invention is to provide new thermo-fiuid printing inks which can be used suddenly they possess a greater hardness andgloss than when cooled slowly; they are free from objectionable thixotropy, or false body," when molten; at temperatures above their melting ranges they have a much lower viscosity than other inks of comparable type, yet the molten ink is cohesive and adheres evenly to letter-press printing surfaces without flying from the press at high printing speeds, and films of the molten ink part readily from the heated printing surfaces when they touch the paper or other stock; they can be printed successfully on high speed rotary letter-presses at web speeds of' 600 to 1500 feet per minute and at temperatures well above 210 F.; and when so printed in thin films they lie properly on the stock, adhere thereto and solidify immediately by loss of heat into the stock. v

I have found that thermo-fluid printing inks possessing these and other desirable qualities can be obtained by incorporating coloring pigments in solid vehicles containing hard thermoplastic resin as a principal ingredient, together with a minor proportion of hydrogenated soya bean oil or the like and not more than a small amount of hard wax. The hard resin ingredient preferably consists mainly of cumarone resin, such :as Cumar V, and a smaller proportion of gilsonite. The hard wax can be carnauba wax, candelilla wax, montan wax or the like. The

ffalse body to the molten ink, while the cumarone imparts toughness, hardness and the With these ingredients the hydrogenatedlike. soya bean oil and wax cooperate to produce the desired fluidity, freedom from tack and other printing qualities mentioned hereinabove.

The content of cumarone resin may be substituted entirely-or in part by hard resins and rosin derivatives, such as wood rosin, hydrogenated rosin ester gum, limed rosin, etc., which are likewise thermo-plastic and similar to cuinarone in their hardness and toughness qualities.

Particularly valuable printing inks embodying my present invention are made with a solid vehicle containing about 25 to 40% of Cumar V,

about 15 to 30% of gilsonite, about 30 to.45% of hydrogenated soya bean oil (soya bean stearin) and less than 15% of carnauba wax.

The content of Cumar should be greater than the content of gilsonite, and the resin content (curnarone and gilsonite) should be greater than the content of hydrogenated soya beanoil. Inks gflaonite imparts mmand ireedcln from of various colorsare obtained bycombining such a vehicle with appropriate amounts and types of coloring pigments. The following specific ex amples are illustrative:

Erample I--Blaclc printing ink Parts by weight "Cumar -V-2 31 Gilsonite 23 Hydrogenated soya bean oil 35 Carnauba w 11 Total vehicle Carbon black 9 Total ln Example II-Black printing ink Parts by weight Cumar .v-z /z 2s Gilsoni I 21- Hydrogenated soya bean oil 40.5 Carnauba wa 10.5

Total vehicle ,1oo.o Carbon black 11.6

Total inl= 111,6

Melting range (drop method): 72-74 C. Viscosity: At 250 F., 1.5 poises; 230 F., 2.1

- poises; 210 F., 3.2 poises (Brookfield synchrolectric viscosimeter) Example III-Yellow printing ink Parts by weight Vehicle (same as in II) Chrome yellow 2'7 Rex orange (Pb molybdate) 3 Total, ink 10o Melting range: 72-74 C. Viscosity: At 250 F., 1.7 poises; 230 F., 2.6

poises;v 210 F., 4.3 poises.

Example I V--Red printing ink Parts by weight Melting range: 73-74 C. Viscosity: At 250 F., 1.4 poises; 230 F., 1.9 poises;

210 F., 2.9 poises,

Example V-Green printing ink Parts by weight- 68 Vehicle (same as in II) Chrome yellow 30 Carbon bla 1 Milori blue '1 Total ink 10o Melting range: 74-75 C.

Viscosity: At 250 F., 2.5 poises; 230 F., 3.3 poises;

210 F., 5.6 poises.

In compounding these inks, the highest melting resin is usually melted first in a suitably heated container, after which the lower-melting resin (gilsonite), the hydrogenated soya bean oil and Printing operations are carried out with the new inks at printing temperatures between about 210 and 250 F., at which the inks possess an exceedingly low viscosity and other qualities desired'for high speed newspaper printing and the like according to the disclosure of my aforesaid copending application. Theviscosity of 'these inks when printed is generally less than 10 poises,

5 whereas the viscosity of ordinary liquid newspaper printing inks generally exceeds 30 poises at room temperatures. The new inks retain their thermo-fluid characteristics after repeated melting and cooling operations, and they are free from volatile solvents and other common printing ink constituents that would cause changes in their consistency to take place from time to time.

The utility of my present invention is not restricted to any particular kind of printing work, nor is the invention restricted to the illustrative examples or other details of disclosure set forth hereinabove, except as may be required by a fair construction oi the appended claims.

I claim:

1. Thermo-fluid printing ink consisting of coloring pigment incorporated in a normally solid vehicle, at least 85% of said vehicle consisting of about to 40% of hard thermo-plastic cumarone resin, about 15 to of gilsonite and about 30 to 45% of hydrogenated soya bean oil.

2. Thermo-fiuid printing ink consisting of coloring pigment incorporated in a normally solid vehicle composed substantially entirely of about 25 to 40% of hard thermo-plastic cumarone resin, about 15 to 30% of gilsonite, about 30 to 45% of hydrogenated soya bean oil and an appreciable proportion but less than 15% of hard wax.

3. 'I'hermo-fluid printing ink consisting of coloring material incorporated in a normally solid vehicle containing about 30% of hard thermoplastic cumarone resin, about 20% of gilsonite, 'about 40% of hydrogenated soya bean oil and about 10% of carnauba wax.

oring material incorporated in a normally solid vehicle composed substantially entirely, by

weight, of an appreciable proportion less than 4. Thermo-fluid printing ink consisting of col- 

